coord(M03): claim facade environment snapshot

coordination/claims/M03-RND-FACADE-ENVIRONMENT-001.md

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+# M03-RND-FACADE-ENVIRONMENT-001 — Renderer environment snapshot boundary
+
+<!-- OPENWC_CLAIM:M03-RND-FACADE-ENVIRONMENT-001:sindo-main-codex:2026-07-18 -->
+
+## Ownership
+
+- Target: M03
+- Program: RND
+- Owner/Agent ID: sindo-main-codex
+- Branch: `work/sindo-main-codex/m03-facade-environment`
+- Lease expires UTC: 2026-07-18
+- Integrator: M03 milestone integrator
+
+## Outcome
+
+Add an immutable world-environment snapshot accepted by `WorldRenderFacade`,
+delegate it to the existing DBC sky controller, and migrate deterministic render
+checkpoint time setup away from direct sky-controller property mutation.
+
+## Non-goals
+
+- Change Light/Area/Skybox DBC selection, interpolation, fog, sun or shader rules.
+- Add weather, indoor lighting, new clock semantics or build-12340 parity claims.
+- Extract the sky service or move its Environment/Node/RID ownership.
+- Change runtime scene defaults, cache formats, streaming behavior or target status.
+
+## Paths
+
+- Exclusive: `src/render/environment/world_environment_snapshot.gd`,
+  `src/tools/verify_world_environment_snapshot.gd`, this claim
+- Shared/hotspots: `src/render/world_render_facade.gd`,
+  `src/scenes/sky/wow_sky_controller.gd`, both runtime streaming scenes,
+  `src/tools/capture_render_checkpoints.gd`,
+  `src/tools/verify_world_render_facade.gd`, `docs/modules/world-renderer.md`,
+  `docs/modules/README.md`, `RENDER.md`, `targets/03-renderer-facade.md`
+- Generated/ignored: `.godot`, native DLL, generated resources, caches and
+  proprietary renderer corpus
+
+## Contracts and data
+
+- Public API: immutable `WorldEnvironmentSnapshot` and
+  `WorldRenderFacade.apply_environment_snapshot`
+- Snapshot input: finite time-of-day hours normalized into one 24-hour day
+- Adapter: explicit `world_environment_controller_path`; facade/controller retain
+  no ownership of caller snapshot
+- Schema/cache/coordinate contracts and runtime defaults: unchanged
+- Consumer: deterministic renderer checkpoint capture; future world-state adapter
+
+## Dependencies
+
+- Requires: integrated M03 facade/ground-query master `cb103e1`
+- Blocks: completion of the facade environment checklist slice and later sky extraction
+- External state: none for contract tests; visual comparison still needs proprietary corpus
+
+## Verification
+
+- Commands: dedicated cold snapshot contract, facade delegation/wiring regression,
+  capture source-boundary regression, renderer manifest/dry-run and repository gates
+- Fixtures: normalization, non-finite rejection, missing/wrong controller,
+  exact snapshot delegation and existing runtime scene wiring
+- Fidelity evidence: preserve existing fixed-time application and all DBC-derived
+  visual logic; seven checkpoint plans remain valid
+- Performance budget: one immutable value allocation per environment update and
+  constant-time main-thread delegation
+
+## Documentation deliverables
+
+- Inline public API docs: snapshot, facade adapter and sky-controller application
+- Module specification: update existing world-renderer specification
+- Data-flow diagram: snapshot producer through facade into DBC sky controller
+- Sequence/state/dependency diagrams: application/failure path and ownership notes
+- Source map/status updates: world-renderer module, module registry if needed, `RENDER.md`
+
+## Simplicity and naming
+
+- Important names introduced: `WorldEnvironmentSnapshot`, `apply_environment_snapshot`
+- Simplest considered solution: one immutable time snapshot over the existing sky implementation
+- Rejected complexity/abstractions: generic weather graph, duplicated lighting DTO,
+  event bus, service container or alternate Environment owner
+- Unavoidable complexity and justification: facade resolves a separate scene-owned
+  sky controller because the streamer does not own outdoor environment rendering
+- Measured optimization evidence: not applicable; bounded constant-time adapter
+
+## Status
+
+- State: claimed
+- Done: contract scope and ownership published
+- Next: implement value, facade/controller adapter, migration, tests and docs
+- Blocked by:
+
+## Handoff
+
+- Commit:
+- Results:
+- Remaining risks:
+- Documentation updated: